/*
 * Copyright (c) 2009-2010, okazoh_tk. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  - Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "./DirectX9Private.h"

#include "alkes/directx9/DirectXVertexBuffer.h"

namespace alkes {

const static VertexTypeTrait s_table[] = {
    {AL_VERTEX_XY|AL_VERTEX_XYZ,    sizeof(float) * 3},
    {AL_VERTEX_NORMAL,              sizeof(float) * 3},
    {AL_VERTEX_COLOR,               sizeof(DWORD)    },
    {AL_VERTEX_SPECULAR,            sizeof(DWORD)    },
    {AL_VERTEX_UV1,                 sizeof(float) * 2},
    {AL_VERTEX_UV2,                 sizeof(float) * 2},
    {AL_VERTEX_UV3,                 sizeof(float) * 2},
    {AL_VERTEX_UV4,                 sizeof(float) * 2},
};

const static DWORD s_table_fvf[] = {
    D3DFVF_XYZ,
    D3DFVF_NORMAL,
    D3DFVF_DIFFUSE,
    D3DFVF_SPECULAR,
    D3DFVF_TEX1,
    D3DFVF_TEX2,
    D3DFVF_TEX3,
    D3DFVF_TEX4,
};

DirectXVertexBuffer* DirectXVertexBuffer::create(DirectXGraphics* graphics, uint32_t vertex_type)
{
    AL_PRE_COND(graphics && 0 != vertex_type, 0);

    return new DirectXVertexBuffer(graphics, vertex_type);
}

void DirectXVertexBuffer::destroy()
{
    delete this;
}

DirectXVertexBuffer::DirectXVertexBuffer(DirectXGraphics* graphics, uint32_t vertex_type)
: VertexBufferHelper(vertex_type)
, graphics_(graphics)
, vbuffer_(0)
, vbuffer_size_(0)
, vertex_size_(VertexBufferHelper::getVertexSize(s_table, AL_LENGTH(s_table), vertex_type))
, vertex_count_(0)
{
}

DirectXVertexBuffer::~DirectXVertexBuffer()
{
    if (vbuffer_)
    {
        vbuffer_->Release();
    }
}

IDirect3DVertexBuffer* DirectXVertexBuffer::getIDirect3DVertexBuffer()
{
    return constructVertexBuffer();
}

DWORD DirectXVertexBuffer::getFVF() const
{
    DWORD fvf = 0;
    uint32_t vertex_type = getVertexType();
    int i;

    for (i = 0; i < AL_LENGTH(s_table); ++i)
    {
        if (s_table[i].type & vertex_type)
            fvf |= s_table_fvf[i];
    }

    return fvf;
}

int32_t DirectXVertexBuffer::getVertexCount()
{
    return vertex_count_;
}

void* DirectXVertexBuffer::getBuffer(int32_t index, int32_t count)
{
    AL_PRE_COND(0 <= index && 0 < count, 0);

    uint32_t buflen = (index + count) * vertex_size_;

    void* p = buffer_.getBuffer(buflen);

    if (p)
        vertex_count_ = index + count;

    return p ? index * vertex_size_ + (uint8_t*)p : 0;
}

int32_t DirectXVertexBuffer::getVertexSize()
{
    return vertex_size_;
}

const VertexTypeTrait* DirectXVertexBuffer::getVertexTypeTraits(int32_t& length)
{
    length = AL_LENGTH(s_table);
    return s_table;
}

struct ColorSetter
{
    static void copy(void* p, const Color* v)
    {
        *((DWORD*)p) = D3DCOLOR_ARGB(v->a, v->r, v->g, v->b);
    }
};

bool DirectXVertexBuffer::onSetDiffuse(int32_t index, int32_t count, const Color* color)
{
    CopyVertexHelper<Color, ColorSetter>::setVertex(
        getBuffer(index, count), getOffsetOf(AL_VERTEX_COLOR), getVertexSize(), color, count);
    return true;
}

bool DirectXVertexBuffer::onSetSpecular(int32_t index, int32_t count, const Color* color)
{
    CopyVertexHelper<Color, ColorSetter>::setVertex(
        getBuffer(index, count), getOffsetOf(AL_VERTEX_SPECULAR), getVertexSize(), color, count);
    return true;
}

IDirect3DVertexBuffer* DirectXVertexBuffer::constructVertexBuffer()
{
    int32_t count = getVertexCount();
    int32_t length = count * getVertexSize();

    AL_PRE_COND(0 < count && 0 < length, 0);

    IDirect3DVertexBuffer* vbuffer = NULL;

    if (vbuffer_ && length <= vbuffer_size_)
    {
        vbuffer = vbuffer_;
    }
    else
    {
        if (FAILED(graphics_->getDevice()->CreateVertexBuffer(
                length,
                D3DUSAGE_WRITEONLY,
                getFVF(),
                D3DPOOL_DEFAULT,
                &vbuffer,
                NULL)))
        {
            return NULL;
        }

        if (vbuffer_)
        {
            vbuffer_->Release();
            vbuffer_ = NULL;
        }
    }

    if (isDirty())
    {
        void* dst;
        const void* src = getBuffer(0, count);
        if (!FAILED(vbuffer->Lock(0, length, (void**)&dst, 0)))
        {
            memcpy(dst, src, length);
            vbuffer->Unlock();

            vbuffer_ = vbuffer;
            if (vbuffer_size_ < length)
                vbuffer_size_ = length;

            setDirty(false);
        }
        else
        {
            vbuffer->Release();
        }
    }

    return vbuffer_;
}

}
